<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <!-- <input v-model.lazy="val" type="text">
        <h3>
            {{ val }}
        </h3> -->

        <!-- <input v-model.number="val" type="text">
        <button @click="fn">点我</button> -->

        <input v-model.trim="val" type="text">
        <button @click="fn">点我</button>
    </div>

    <script src="./vue.js"></script>

    <script>
        new Vue ({
            el : "#app" ,
            data : {
                val : ''
            },
            methods : {
                fn(){
                    console.log( this.val );
                }
            }
        })
    </script>
</body>
</html>